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What is the difference between an interface and an abstract class in PHP?

A An interface declares method signatures only and a class may implement many; a class may extend only one abstract class
B An abstract class cannot contain methods
C Interfaces can hold state
D They are identical

Answer

An interface declares method signatures only and a class may implement many; a class may extend only one abstract class

Use an interface for the contract and an abstract class where subclasses genuinely share implementation and state.

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